Stud calculator



FIG. 1 is a front plan view;

FIG. 2 is a perspective view taken from the front, with the displayblank and the stud calculator in off condition;

FIG. 3 is a top end view;

FIG. 4 is a bottom end view;

FIG. 5 is a side view;

FIG. 6 is the other side view; and,

FIG. 7 is a rear view.

The ornamental design for a stud calculator, as shown.